The model number should be located on the control module.
The control module will be a black box typically mounted under the drivers side dashboard near the steering column, approximately the the size of a man's wallet (3"x4") with wires coming out of the side.
EXAMPLE FRONT CONTROL MODULE VIEW
There is a sticker with a model number and/or a 10-14 character serial number on it.
EXAMPLE REAR CONTROL MODULE VIEW w/STICKER
By giving us the Model number (if it appears on the sticker) or the first four numbers of an older model serial number, or the last six numbers of a newer model serial number, we can tell you the make and model of your system.
If you cannot locate the number, we recommend that you take the vehicle to an authorized dealer/installer.